Workshops, Seminars, Symposiums & Conferences

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item: Conference-Abstract
Analysis of the heat column formation in a 10 storey building
Prasath, K; Thavanees, S; Prakalathan, A; Ranasinghe, RACP; Wijewardane, MA
This paper aims to analyse the formation of heat column and its effects on the performance of the air conditioning systems. The computational fluid dynamic techniques combined with experimental validation were used to investigate the temperature distribution along the heat column under different loading conditions. Further the influence of wind and the humidity were also predicted. Results show that a significant loss of performance of the AC system can be expected under the influence of the heat column.
item: Conference-Abstract
Analysis of the performance of three phase induction motor under supply source unbalance
Sudasinghe, SPM; Jayatunga, JVUP; Wadduwage, D. Prasad
Presence of voltage unbalance adversely affects the operation of three phase induction motors. Influence of unbalanced supply voltages on the adverse performance of the motor is intensified by the fact that a small unbalance in phase voltages can cause a disproportionately larger unbalanced phase currents. Thus, the additional heat produced in both the stator and the rotor windings lead to a reduction in the motor efficiency, demanding motor de-rating which was established to depend on the voltage unbalance factor. This study investigates the effects of varying unbalanced voltages which lead to the same voltage unbalance factor, on the operation performance of an induction motor and the effect of positive sequence voltage on it. Statistical analysis is carried out to identify the possible variation range for the performance parameters of induction motors of different scales for different unbalance voltage conditions.
item: Conference-Abstract
Capacitor switching transient analysis on a transmission grid substation
Hemapala, KTMU; Munasinghe, DLP
The quality of electric power system has a great concern and also it has been a constant topic of study. A transient originated from capacitor bank switching are main reason which affects the power quality. The analysis, simulation and optimal use of capacitor banks under harmonic conditions are required in a power network to optimally locate and sizing of a capacitor bank. The breaker switched capacitor (BSC) banks are commonly used for power factor correction, reactive power requirement and voltage support by many utilities in the world. Ceylon electricity board (CEB) has also installed total of 370 Mvar capacitor banks island-wide in transmission grid substations (GSS) in 33 kV level. The motivation for the study is the switched off capacitor banks at Thulhiriya GSS due to the failure of 100 Mvar BSC banks installed at the Pannipitiya GSS. Thulhiriya GSS was modelled as the case study to analyze the switching transients of the 33 kV BSC banks to the system. Data for the selected substation were recorded and analyzed and the selected substation was modelled using PSCAD simulation program to analyze the transients and harmonics. The results obtained for the Thulhiriya GSS are extrapolated to a general concept to suit any substation in the CEB network.
item: Conference-Abstract
The Colombo port city, its major issues and the road to successful implementation
Thoradeniya, DL; Ranasinghe, M
The Colombo Port City Project (CPCP) is regarded as one of the largest and most ambitious Sri Lankan development projects to date. At times classified as a Public-Private Partnership (PPP), the CPCP is a collaborative project between the Government of Sri Lanka and a foreign private entity. The project faced early setbacks and controversy due to several issues, including alleged mishandling of key processes. The aim of this paper is to make recommendations for the successful implementation of the CPCP through the development of a guideline inspired by previous studies on critical success factors for PPPs, supplemented by the results of an analysis of issues surrounding the CPCP. The methodology of the study relies on interviews with key informants, official documentation such as Environmental Impact Assessments, and the literature review. Review of the CPCP indicated that while current feasibility measures covered Economic and Environmental issues through means such as the Extended Cost Benefit Analysis etc., there appears to be inadequate analysis of Political, Social and Legal issues which played a major role in halting the CPCP. Findings highlight the importance of incorporating the analysis of Political, Social and Legal issues beyond what is currently practiced in feasibility studies. It also points towards the necessity of changing current practices, policies and processes relating to PPP or mega development projects in Sri Lanka.
item: Conference-Abstract
Design and development of an intelligent lighting system for operation theatres
Roshan, TAU; Sachinthana, LMN; Senarathna, PMNK; Amarasinghe, YWR; Welgama, WPD; Jayathilake, WADM
Maintaining proper light intensity level inside of an operation theatre is a critical factor for a surgery to be perform successfully. The focusing location and the intensity level is controlled by manually in currently available systems. But, disruption of surgeon’s attention and possibility of infection to the surgery are increased by the manual controlling method. So, designing an intelligent lighting system for operating theatre which can maintain the intensity values to the required level without shadow effect to the operation area is an important requirement. Drawbacks relating to the existing light manipulation mechanism are identified and introduced new mechanism which is compatible with the dynamic system. To ensure the dynamic capabilities of the designed system, a simulation has been done using MATLAB SimMechanics. Suitable sensory feedback system is implemented to identify the target point location, orientation and its light intensity as well. The sensory feedback system is consisted with three Light intensity sensors, one Inertial Measurement Unit (IMU) and an array of Light Dependent Resistors (LDR). IMU is used to measure the tilt angle of the sensor panel which is equivalent to the hand of the surgeon. Light intensity sensors are used to manipulate the light with proper intensity to the target location. LDRs are used to take the position of the sensor panel. Location and the orientation of the surgeons hand have been taken as the target to follow within a certain workspace by maintaining equal distance to the target at all the time to ensure proper illumination. A prototype has been developed to prove the concept with above mentioned methods.
item: Conference-Abstract
Design optimization of power generator soundproofing enclosure using genetic algorithm tool
Ehelepola, I; Chandima, DP
This paper introduces a numerical method for optimally designing a passive noise control enclosure for depressing air borne noise of reciprocating engine type power generators. Sound pressure level of soundproofed power generator has been modeled using sound pressure level of unenclosed power generator and insertion loss of passive enclosure. In this context, mathematically developed acoustic equation optimized for the design variables of dimensions, panel material properties and thickness of enclosures under constrains of sound pressure level, cost, weight, and size of enclosures. Genetic Algorithm tool was used for optimization and it has developed in MATLAB software. The developed optimized model has validated by designing and fabricating a passive enclosure for a diesel power generator with a capacity of 22kVA. Eventually the developed design procedure is giving a simple and fast design tool with Graphical User Interface run in MATLAB to provide locally optimized enclosure design parameter which can be used for conceptualize the enclosure design.
item: Conference-Abstract
Distribution of responsibilities and applicability of risk assessments in construction safety
Asanka, WA; Ranasinghe, M
Safety and Health enhancements are tendencies of today‟s construction industry. Accident mitigation measures and legislations are publishing by authorities, enhancing the public awareness. Safety management systems (SMS)are inserting to construction management schemes and it is mandatory in most countries (Singapore, Australia, etc.). Assessing activity based risk or Risk Assessments (RA) is one of the sub elements under SMS. RA is a systematically arranged set of action statements to explain the safest work procedure prior to actual site work. RA‟s are serving effectively in construction sites identifying and mitigating the inherent risks. However, effective practicing of RAs are challengeable due to human behaviour, irresponsibility, negligence or ignorance, result in accidents. Therefore, personal interpretations and appreciation of RAs are timely requirement. This study examined the detailed RAs of “work at height” activities in varying situations. Work at high elevations cause “Fall from height” accidents and it is the leading fatality type in most countries. A questionnaire was launched to investigate the construction professional‟s appreciation, consideration, and ability to implement action statements on work places in Singapore. The findings were extrapolated towards Srilankan industry to trace the way for better safety performance. The objectives of the current research is to (1) quantify risk associated with the current work practices and compare it with the performance-risk due to past accident statistics (2) establish responsibility weightings for the construction team (3) investigate applicability of existing work practices (4) prepare probabilistic data set for the future studies to mitigate accidents. Even though, highly regularised safety and health protocols are enforced in Singapore, construction team‟s ignorance on RA is 13% ~16%, and willingness to take overall site responsibility of supervisor, the key for many SMSs is significantly low as 8%, and further studies are proposing. Anticipated probabilistic accident severities (fatal, major, minor and near misses) due to ignoring these statements are high as 26% ~41%, which also alarms industry to count as additional risk.
item: Conference-Abstract
Distribution system fault localization, fault restoration and network reconfiguration using multi agent based system
Panagoda, A; Hemapala, KTMU; De Silva, N;
Power distribution networks reduce their reliability during the fault localization, isolation and network reconfiguration. The fault localization of High voltage and medium voltage systems consumes more time and network reconfiguration get complex when there are more interconnections. Multi Agent System is simply developed based on the one important component named as agent and the system comprises of more than one agent is named as the multi agent system. There are various definitions for the multi agent system. The agent is the most important concept of the multi agent system and agent is defined as a software component having special features to bring its autonomy. With its special features agent can act as a human agent and it helps to model complex system and introduce the possibility of having common or conflicting goals. The agent comprises with the main special features of autonomous, social, reactive and proactive. Therefore the objective of the study is to provide a methodological approach to manage the fault restorations of power distribution system in Sri Lanka using a de-centralized technique. Agent based solution was implemented with Multi Agent System (MAS). The system comprises with Application layer, Interface layer and communication layer. The application layer was developed using Java Agent Development Environment (JADE).
item: Conference-Abstract
Effect of Chemical Oxygen Demand (COD) to Sulfate (SO4-2) ratio on sulfate reduction in anaerobic digestion of sulfate rich wastewater
Samarathunga, IR; Rathnasiri, PG; Hansaka, MAR; Kawinda, UGYS; Ananda, RYB
Effluents discharged from some industries are both high in chemical oxygen demand. If sulfate is not treated up to the standards before discharging, it will contaminate with the surface or ground water bodies. Although sulfate does not cause any direct impact on the environment, biological transformation of sulfate under anaerobic conditions produces toxic hydrogen sulfide. There exists a competition between Sulfur Reducing Bacteria (SRB) and Methanogenic Bacteria (MB) for same available substrate. COD/SO4-2 ratio represents the fraction of electron flow for SRBs and MBs, which determines the sulfate reduction. This research study, investigates the influence of COD/SO4-2ratio on the performance of the sulfate reduction in anaerobic digestion. Laboratory experiments were conducted for high and low concentrations of substrate loading at COD/SO4-2ratioof 7 and 3. Total percentage sulfate reduction for high and low concentrated synthetic wastewater at same COD/SO4-2 of 7 and 3are 50.5%,48.9%, 24.8% and 4.8%respectively. The average sulfate reduction rates for high and low concentrations at COD/SO4-2 of 7 and 3 are 111 ± 11.1 mg/l/d and 55 ± 5.8 mg/l/d, 62 ± 5.4 mg/l/d and 10 ± 1.6 mg/l/d respectively. Experimental results indicated that percentage sulfate reduction is efficient at COD/SO4-2 of 7 than at 3 and rate of sulfate reduction is high in high concentrated influent than low concentrated influent, while the COD/SO4-2 is kept at a constant. Therefore when these results are commercialized, for sulfate rich wastewater treatment, precautions have to be taken to add sufficient amount of electron donors to maintain the COD/SO4-2ratio for complete sulfate reduction.
item: Conference-Abstract
Effect of lipid inhibition in anaerobic wastewater treatment : a case study using desiccated coconut wastewater
Samarasiri, BKT; Mihiranga, PAD; Rathnasiri, PG
Anaerobic treatment processes have been extensively developed for the treatment of various wastewaters containing high concentrations of organic substrates including proteins, carbohydrates and lipids. The desiccated coconut industry in Sri Lanka is one of the industries where wastewater with high concentrations of lipids containing medium chain saturated fatty acids (~55%), long chain saturated fatty acids (~35%) and long chain unsaturated fatty acids (~10%) is generated. The long chain organic molecules of lipids undergo a series of complex biochemical reactions such as hydrolysis, acidogenesis, acetogenesis and methanogenesis during anaerobic digestion. According to previous studies, high concentrations of lipids have an inhibitory effect on anaerobic treatment processes, due to the mass transfer limitations and toxicity caused by long chain fatty acids (LCFA) towards syntrophic substrate-degrading bacteria. Undesirable effects of accumulation of LCFA in anaerobic reactors comprise of gradual drop down of rate of biogas production and derogatory effects on quality characteristics of effluents such as chemical oxygen demand (COD), biochemical oxygen demand (BOD) and oil and grease removal efficiencies after anaerobic treatment, causing the treatment process inefficient. According to the case study, desiccated coconut wastewater (DCWW) has pH 4.0 - 5.5, COD 4,000 mg/l - 8,000 mg/l, BOD 1,000 mg/l - 5,000 mg/l and total lipids 4,000 mg/l. In anaerobic treatment of DCWW, the COD removal efficiency rapidly changes from 90% - 30% due to the lipid inhibition caused by medium chain and LCFA in DCWW such as lauric acid and myristic acid. The treatment efficiency of anaerobic digestion can be enhanced via different physicochemical strategies.
item: Conference-Abstract
Evaluation of level of service for two-lane roads in Sri Lanka
Jayaratne, DND; Jayasinghe, PWPR; Pasindu, HR
Two-lane roads form a major part of Sri Lanka‟s road network. The ability to accurately estimate lane capacity and Level of Service (LOS) is a key element in highway planning and manage-ment, which is essential to develop an efficient road network. The current methodologies to estimate capacity and level of service do not satisfactorily incorporate the traffic and roadway characteristics in Sri Lanka. Speed-density models were developed using traffic flow data from surveys carried out at 14 locations, where the speed, flow, vehicle type was recorded. In addition, PCU factors were derived for eight vehicle types. The speed-flow model was derived from the results to calculate the capacity for a two-lane road, which was also adopted to define new threshold values for parameters such as average travel speed, volume to capacity ratio to evaluate LOS. The capacity estimate and new LOS evaluation criteria offers more applicable parameters to assess the existing highway condition for highway upgrading and it can be incorporated into transport planning models as an input when de-fining road network parameters.
item: Conference-Abstract
Evaluation of use of Tea waste Bio-Char (TBC) as alternative filler for Natural Rubber (NR)
Iresha, H; Egodage, SM; Weerakoon, CS; Muthukumarana, PU; Hewamallikage, YR
Tea waste generated in tea factories, which is the portion that cannot be marketed, is an abundant natural waste in Sri Lanka. Some of the tea manufacturers have converted this bulk waste into its bio-char by using pyrolysis in addition of using for composting and soil conditioning. Considering the high carbon content shown in bio-char, and its nature of biodegradability, renewability, high moisture, smells, toxins and electrosmogs absorption ability, and low thermal conductivity, powdered tea waste bio-char (TBC) can be used as filler in rubbers and will tend to use in a wide spectrum of applications. Bio-char obtained from different natural sources have been researching for different applications especially as filler for different rubbers. However, using TBC in NR as filler is novel. This study adduces the results of proximate analysis of TBC, cure properties, and mechanical properties of TBC/NR composites such as tensile properties, tear strength, hardness, with respect to TBC particle size (125 µm< X < 250 µm and 125 µm X)and loadings from 10 phr to 50 phr at 10 phr intervals. The properties were compared with those of NR composites prepared with carbon black conventional filler (N330). Microscopic images of cross sections of composites were used in order to explain the trends in properties obtained.
item: Conference-Abstract
Fault management algorithm for voltage feeder automation in electricity distribution
Dissanayaka, DMDK; Hemapala, KTMU; Rodrigo, WDAS
The term Distribution Automation (DA) generally refers to a distribution network which is equipped with the advanced technologies dedicated for purposes such as, ease of real time monitoring and controlling, reliability improvement management, integrating of distribution network and electricity market operation. Improving the reliability of electric power delivered to the end users is one of the main targets of employing distribution automation. Therefore, developing autonomous fault isolation and power restoration system for Low Voltage (LV) distribution can be an attractive reliability enhancement solution for the electric utilities. Manual operated LV distribution network has several activities in fault management. Most of the activities are unwanted time consuming activities due to the lack of automation in the LV distribution network. Time duration for fault management activities in manual operation has been measured in order to validate the proposed automation system. Electrical utility industries are not focusing on automating LV distribution system due to the complexity of the LV distribution network feeders. A low cost and simple system has introduced by the authors as the first step. A new algorithm for fault detection, isolation and power restoration to the healthy section was introduced. Initial step of the algorithm is to separate the faulty section which is occurred either sides of the adjoining switch. Second part is the faulty section finding algorithm. Third step is power restoration algorithm for faultless section and at the end reset the system. The proposed algorithm is an open algorithm and hence electric utilities can be used it for LV feeder automation easily. Accuracy of the proposed algorithm was checked with the developed prototype system.
item: Conference-Abstract
Feasibility study of shallow foundation on geocell reinforced soil in Sri Lanka
Sanjei, C; De Silva, LIN
Geocells are mostly used to strengthen soft soil in many Asian countries in recent days. They provide faster, feasible and environmentally friendly solutions. In Sri Lanka however, Geocell is not much familiar soil improvement technique. This paper discuss the development of a three dimensional numerical model to simulate the behaviour of geocell reinforced sand using PLAXIS 3D and feasibility of geocell as reinforced soil in Sri Lankan construction industry. The shape has a major influence in stress distribution. In this study, a 3D cad model was imported to PLAXIS 3D and modeled using geogrid structural element. Unreinforced, singly reinforced and doubly reinforced cases were investigated in feasibility studies using 3.0m x 3.0m footing prototype. Then optimum B/C ratio (Bearing capacity/Estimated cost) was calculated by changing the footing size (trial and error method).Footing was analysed for an axial load of 1200kN.It was found that footing on doubly reinforced with 1.6m x 1.6m is most feasible footing with soil improvement. Sustainable feasibility study was carried out to check the suitability of geocell in Sri Lankan context. The study suggests that influence of economical performance attributes and social performance attributes' could be higher than environmental performance attributes when geocell is used as soil reinforcement.
item: Conference-Abstract
Feasibility study of shallow foundation on geocell reinforced soil in Sri Lanka
Sanjei, C.; De Silva, L.I.N.
Geocells are mostly used to strengthen soft soil in many Asian countries in recent days. They provide faster, feasible and environmentally friendly solutions. In Sri Lanka however, Geocell is not much familiar soil improvement technique. This paper discuss the development of a three dimensional numerical model to simulate the behaviour of geocell reinforced sand using PLAXIS 3D and feasibility of geocell as reinforced soil in Sri Lankan construction industry. The shape has a major influence in stress distribution. In this study, a 3D cad model was imported to PLAXIS 3D and modeled using geogrid structural element. Unreinforced, singly reinforced and doubly reinforced cases were investigated in feasibility studies using 3.0m x 3.0m footing prototype. Then optimum B/C ratio (Bearing capacity/Estimated cost) was calculated by changing the footing size (trial and error method).Footing was analysed for an axial load of 1200kN.It was found that footing on doubly reinforced with 1.6m x 1.6m is most feasible footing with soil improvement. Sustainable feasibility study was carried out to check the suitability of geocell in Sri Lankan context. The study suggests that influence of economical performance attributes and social performance attributes' could be higher than environmental performance attributes when geocell is used as soil reinforcement.
item: Conference-Abstract
Modified ply thickness for classical lamination theory for thin woven fibre composites
Herath, HMST; Mallikarachchi, HMYC
This paper considers the applicability of classical lamination theory for woven composites for the analysis of bending behaviour of such composites. Although the Classical lamination theory is directly used for the analysis of uni-directional laminates with a good accuracy, it cannot be directly used for the analysis of bending behaviour of woven composites, because it is found that it gives a significant error margin. Therefore this paper has looked into the possible causes for that error margin and significance of the contribution from each cause to the overall error margin. This papers has identified that the sensitivity of the thickness of a tow has a significant contribution to the error margin and therefore a suitable modification factor has been introduced to reduce the error margin caused by the thickness variation. A representative unit cell model was developed to predict the stiffness, failure of fibre composites and verification of the thickness modification to Classical lamination theory.
item: Conference-Abstract
An Optimised stimulus for hearing screening of infants using the auditory brainstem response
Manamperi, WN; De Silva, AC
This study presents an effective stimulus which enhances the auditory brainstem responses (ABRs) from the underlying EEG. A range of different types of stimuli are implemented and tested using a modified ABR model which is a mathematical approximation of the auditory pathway that generates the ABR. The optimised stimulus is based on a chirp signal which is designed to compensate the travelling delay caused by the anatomical structure of the cochlea, especially at sound intensity levels near the hearing threshold. Results suggest an average increase of 36% in the amplitude of wave V compared to the chirp which used to design the optimised stimulus.
item: Conference-Abstract
Performance analysis of pedestal and table fans
Sugathapala, AGT; Ranasinghe, RACP; Anthujan, B; Srikandaraj, S; Vipulan, V
The pedestal and table fans are widely used to provide air mixing and comfort region in enclosed spaces. There are different brand of fans with various blade shapes, sizes and number of blades which lead to different level of performances. Aerodynamic characteristic is one of the important aspect which affects the fan performance. Performance of fourdifferent type of fans were analysed through the experimental measurements of velocity distribution, power consumption and angular velocity. A test rig was constructed with suitable instrumentation and integrated using a computerised data acquisition platform to acquire axial flow velocity measurements at each plane. The velocity distribution was measured at sufficient number of planes with different regulator position of the fan. Key parameters such as the flow rate, kinetic energy, linear momentum and the jet diameter were calculated from the experimental data. Different velocity distributions were obtained for different type of fans in the analysis of the data. Iso-velocity lines were obtained to analyse the spread of the velocity. Results show that the velocity profiles of the fans depend on the regulator position and blade parameters such as blade shape and material. It is also found that the overall energy efficiency of the fan depends on the angular velocity for different regulator positions. Further the incremental flow rate was also calculated to analyse the percentile change in flow rate for each regulator position. The impact on the performance when the fan was set to oscillate is also discussed in this paper. The results of the present study indicate the complexity of the influence of various parameters on the performance of the fan such as blade shape, angular velocity and power consumption and the necessity of a detailed experimental analysis of the velocity distribution of the fan for performance analysis.
item: Conference-Abstract
Pore-pressure and fracture pressure gradient prediction model for few exploration blocks in mannar and cauvery basins, Sri Lanka
Jayasinghe, JMSTW; Kurukulasuriya, AC; Jayasinghe, WMTU; Wickrama, MADMG; Senadhira, AMADM; Ratnayake, NP
Wellbore instability, kick and loss of circulation through fractures are the most significant problems observed during petroleum drilling. Selection of an appropriate mud weight is the key solution for these problems. To select a safe range of mud weights, the knowledge of formation pore pressure and fracture gradient of the drilling area is essential. This paper aims to find the most suitable fracture pressure gradient and pore-pressure models for Mannar and Cauvery basins in Sri Lanka. Three pore-pressure prediction strategies, namely, Hottman and Johnson ,1965 [4] method, Ben Eaton ,1975 [9]method and D-exponent method-Eaton ,1975 [9]and three fracture pressure gradient prediction methods, namely, Hubbert and Willis ,1957 [10] method, Matthews and Kelly (1967) method and Ben Eaton (1969 [6] method, were used in this research. Petro-physical data of four wells previously drilled in the Mannar basin and Cauvery basin in Sri Lanka were used to predict pore pressure and fracture pressure gradient using above methods. Then the predicted values were compared with the actual pressure values obtained from well log records of same wells. Area specific variables, including Poisson ratio and Matrix Stress Coefficient were determined prior to the fracture pressure gradient prediction. After determining the suitable prediction methods, a basin analysis software (Petrel), (Schlumberger, 2010.1) software was used to visually interpret and analyse the results. The results of the Pore-pressure analysis suggested that a combination of Hottman and Johnson method and D-exponent-Eaton method are suitable pore pressure prediction models for the study area. The analysis of fracture pressure gradient strategies found that the Ben Eaton method is the most suitable method to predict the fracture pressure gradient of the area.
item: Conference-Abstract
Preparation of nano silver based anti-bacterial coating for food packaging applications
Egodage, DP; Jayalath, HTS; Samarasekara, AMPB; Amarasinghe, DAS
Food packaging plays an important role in preserving food throughout the distribution chain. Food packaging can delay food deterioration, keep the favourable properties of food processing, increase the shelf life or the usable time of the food while keeping the quality and the security of food. To maintain product quality and freshness of the food attentive selection of packaging materials and technologies should be done. The conventional food packaging used in food packaging industry are glass, metals like aluminium and tin, paper and plastics. Plastics used for food packaging can be found in wide variety with the forms of rigid or flexible. Due to design flexibility of plastics they can be formed into various structural shapes. The main two important properties of plastics are heat seal-ability and printability which can be integrated in line with the process of filling food. Variable permeability to light, gas and vapour and lack of anti-bacterial activity of the packaging applications are main drawbacks of plastics. Nowadays Nano sized particles which are in between 1-100 nm in diameter become an area of intense scientific attract due to its wide range of applications in packaging, medical, optical and electronic industries. Nano particles of metals like silver and gold disclose significantly distinct properties compared to bulk properties. The objective of this research was to prepare nano silver based anti-bacterial coating for polypropylene based food packaging applications. In this research, Ag/PVA (Polyvinyl Alcohol) solution was prepared by in situ reduction method, in which silver nitrate and polyvinyl alcohol (PVA) acted as a precursor and a capping agent. AgNPs formation was tested with UV Spectrometer. Ag/PVA was cross-linked with citric acid and coated on UV treated polypropylene sheets to make a film. Prepared samples were tested for anti-bacterial activities. Nano silver coated polypropylene samples showed enhanced anti-bacterial effect. Therefore, this technique can be developed to apply in various food packaging applications to extend the shelf life.